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（1）原形、过去式、过去分词相同： cast/ cost/ cut/ hit/ hurt/ let/ put/ broadcast/ burst/ read/ red/ set/ shut/ spread/ thrust/ upset （2）原形、过去式相同，过去分词不同： beat/ beat/ beaten （3）原形、过去分词相同，过去式不同： come/ came/ come become/ became/ become run/ ran/ run overcome/ overcame/ overcome （4）原形不同，过去式，过去分词相同： feel/ felt/ felt sleep/ slept/ slept leave/ left/ left smell/ smelt/ smelt keep/ kept/ kept creep/ crept/ crept kneel/ knelt/ knelt sweep/ swept/ swept spell/ spelt/ spelt weep/ wept/ wept catch/ caught/ caught fight/ fought/ fought teach/ taught/ taught think/ thought/ thought stand/ stood/ stood lay/ laid/ laid understand/ understood/ understood pay/ paid/ paid bleed/ bled/ bled say/ said/ said feed/ fed/ fed stick/ stuck/ stuck lead/ led/ led strike/ struck/ struck meet/ met/ met tell/ told/ told | 
